ECAP挤压工艺参数对Mg10Al0.5Sb合金组织与性能的影响

Microstructure and Mechanical Property of Mg10Al0.5Sb Alloy Prepared by ECAP with Different Pressing Parameters

为了确定适合于Mg10Al0.5Sb合金ECAP挤压的温度和速率,分别在230、250、270和280℃下以1.5、2 mm/min两种速率对合金进行1道次挤压,并研究了不同挤压工艺参数下合金的微观组织与力学性能。研究表明,在相同速率下,随着挤压温度的升高,挤压后合金试样的裂纹减少,合金发生了动态再结晶,力学性能表现为先升高后降低;在280℃下,以1.5mm/min的挤压速率挤压获得的合金试样外观完整,合金的晶粒大小均匀,拉伸强度和伸长率分别为240MPa和3%,比以2mm/min的挤压速率挤压的合金力学性能有所提高。最终得到Mg10Al0.5Sb合金ECAP挤压工艺的温度和速率分别为280℃和1.5mm/min。

Mg10Al0.5Sb alloy was processed by equal channel angular pressing（ECAP） for one pass at 230 ℃,250 ℃,270 ℃ and 280℃ with the pressing speed of 1.5 mm/min and 2 mm/min,respectively,in order to determine the optimal pressing parameters.The microstructure and mechanical property of the processed alloy were investigated.The results show that the cracks on the surface of the processed samples decrease and the mechanical properties increase firstly and then decrease with the increase of the pressing temperature owing to the occurrence of recovery and recrystallization at the same pressing speed.When the pressing speed is 1.5 mm/min,the surface of the sample is smoother and the grain size of the alloy is more homogeneous,and the alloy obtains the higher values in the mechanical properties in terms of the tensile strength of 240MPa and the elongation of 3%,compared with the pressing speed of 2 mm/min.As a result,the optimal pressing parameters of Mg10Al0.5Sb alloy are that the pressing temperature is 280 ℃ and the pressing speed is 1.5 mm/min.